December is one of the cooler months of the year in San Angelo, with average highs near 15.5°C and lows around 1.8°C (mean 8.7°C). It is one of the drier months, averaging 24 mm of rainfall and 63% relative humidity across the period.
December is one of the cooler months of the year in San Angelo. Across 45 years of records, the warmest December in San Angelo was 2021 — when the month averaged 15.6°C — while the coldest was 1983 at 3.7°C. Typical December days reach 15.5°C with nights near 1.8°C. The long-term trend is warming, about 0.8°C per decade.
December is one of the drier months in San Angelo, averaging 24 mm of rainfall. The wettest December on record was 1991 with 125 mm, while the driest was 2025 at 0 mm.
Relative humidity in San Angelo during December averages 63%. The most humid December was 1986 at 81%, and the least humid was 1999 at 46%.
December receives about 3 kWh/m²/day of solar energy in San Angelo. The sunniest December was 2003 at 3.5 kWh/m²/day, and the cloudiest were 1984 and 1986 at 2.3.
Average wind speed in San Angelo during December is 3.1 m/s. The windiest December was 2008 at 3.7 m/s, while the calmest were 1986 and 1994 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.3°C | 8.6°C | 7.9°C | 8.8°C | 11.6°C | +4.3°C |
| Avg High | 13.9°C | 15.3°C | 14.9°C | 15.5°C | 18.9°C | +5°C |
| Avg Low | 0.8°C | 1.9°C | 1.0°C | 2.1°C | 4.4°C | +3.6°C |
| Avg Rain | 31 mm | 28 mm | 16 mm | 28 mm | 16 mm | -15 mm |
December temperatures in San Angelo have risen by about 4.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -15.6°C (1989) to a record high of 30.7°C (2021).
Rainfall in December is one of the drier months, averaging 24 mm, with a wettest year of 125 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.9°C per decade while lows rose 0.6°C per decade, widening the gap between day and night.
A quieter season to visit San Angelo
If your dates are flexible, the more temperate months of April and October tend to be the most comfortable for visiting San Angelo. That said, December — with days averaging 15.5°C and nights around 1.8°C (mean 8.7°C) and low rainfall (24 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.7°C | 12.1°C | 4.5°C | 28.4°C | -1.8°C | 0 mm | 58% | 3.3 m/s | — |
| 2024 | 19.2°C | 12.3°C | 5.4°C | 26.0°C | -1.1°C | 6 mm | 62% | 2.9 m/s | 3 |
| 2023 | 17.8°C | 10.7°C | 3.6°C | 25.8°C | -3.5°C | 37 mm | 64% | 3 m/s | 3.3 |
| 2022 | 16.4°C | 10.1°C | 3.7°C | 25.3°C | -11.3°C | 15 mm | 66% | 3 m/s | 2.7 |
| 2021 🔥 | 23.3°C | 15.6°C | 7.8°C | 30.7°C | -0.3°C | 1 mm | 50% | 3.1 m/s | 3.3 |
| 2020 | 16.8°C | 9.1°C | 1.3°C | 26.3°C | -4.3°C | 35 mm | 51% | 3.4 m/s | 3.3 |
| 2019 | 18.0°C | 10.4°C | 2.7°C | 27.4°C | -3.7°C | 28 mm | 56% | 2.8 m/s | 3.4 |
| 2018 | 13.3°C | 7.5°C | 1.8°C | 20.9°C | -4.5°C | 61 mm | 73% | 3.2 m/s | 2.8 |
| 2017 | 15.0°C | 8.4°C | 1.7°C | 26.7°C | -7.6°C | 24 mm | 66% | 3 m/s | 2.5 |
| 2016 | 15.0°C | 8.6°C | 2.2°C | 25.5°C | -9.9°C | 25 mm | 70% | 3.2 m/s | 2.4 |
| 2015 | 16.6°C | 9.5°C | 2.4°C | 25.3°C | -5.3°C | 47 mm | 68% | 3.2 m/s | 3.2 |
| 2014 | 15.9°C | 10.2°C | 4.4°C | 23.6°C | -6.3°C | 12 mm | 70% | 3.2 m/s | 2.5 |
| 2013 | 13.5°C | 6.7°C | -0.1°C | 26.0°C | -7.5°C | 28 mm | 67% | 3 m/s | 2.9 |
| 2012 | 17.7°C | 10.1°C | 2.6°C | 27.3°C | -6.0°C | 3 mm | 50% | 3.4 m/s | 3.3 |
| 2011 | 12.9°C | 7.0°C | 1.0°C | 24.0°C | -7.1°C | 37 mm | 69% | 3.2 m/s | 2.5 |
| 2010 | 17.0°C | 9.4°C | 1.9°C | 27.3°C | -3.4°C | 18 mm | 49% | 3.1 m/s | 3.4 |
| 2009 | 12.4°C | 5.7°C | -1.0°C | 21.9°C | -5.8°C | 39 mm | 67% | 2.8 m/s | 3 |
| 2008 | 16.3°C | 8.8°C | 1.4°C | 24.4°C | -4.8°C | 1 mm | 50% | 3.7 m/s | 3.2 |
| 2007 | 16.2°C | 8.6°C | 1.1°C | 25.6°C | -4.5°C | 8 mm | 60% | 3.3 m/s | 3.2 |
| 2006 | 15.8°C | 8.8°C | 1.8°C | 24.6°C | -4.2°C | 28 mm | 59% | 3.4 m/s | 3.2 |
| 2005 | 14.9°C | 7.9°C | 0.8°C | 27.7°C | -9.5°C | 2 mm | 56% | 3 m/s | 3.2 |
| 2004 | 14.1°C | 7.6°C | 1.0°C | 20.8°C | -7.4°C | 10 mm | 71% | 3.2 m/s | 3.3 |
| 2003 | 16.9°C | 9.5°C | 2.1°C | 24.4°C | -4.5°C | 2 mm | 54% | 3.6 m/s | 3.5 |
| 2002 | 15.3°C | 8.3°C | 1.4°C | 25.1°C | -3.2°C | 38 mm | 67% | 3.2 m/s | 3 |
| 2001 | 15.3°C | 8.7°C | 2.1°C | 22.4°C | -5.3°C | 16 mm | 63% | 3 m/s | 3 |
| 2000 | 12.0°C | 5.4°C | -1.1°C | 21.4°C | -6.4°C | 15 mm | 69% | 3.3 m/s | 2.8 |
| 1999 | 16.8°C | 9.3°C | 1.8°C | 26.1°C | -5.7°C | 5 mm | 46% | 3.2 m/s | 3.2 |
| 1998 | 15.3°C | 8.5°C | 1.7°C | 25.6°C | -8.3°C | 22 mm | 65% | 3.1 m/s | 2.8 |
| 1997 | 13.9°C | 6.9°C | -0.1°C | 21.7°C | -5.5°C | 42 mm | 64% | 3.4 m/s | 3.1 |
| 1996 | 16.5°C | 9.2°C | 2.0°C | 24.5°C | -7.8°C | 1 mm | 61% | 3.6 m/s | 3.2 |
| 1995 | 15.7°C | 8.6°C | 1.5°C | 26.5°C | -6.4°C | 7 mm | 60% | 3 m/s | 3 |
| 1994 | 16.5°C | 10.3°C | 4.0°C | 25.7°C | -2.0°C | 32 mm | 70% | 2.5 m/s | 2.6 |
| 1993 | 15.4°C | 9.0°C | 2.6°C | 23.8°C | -4.9°C | 18 mm | 57% | 3.1 m/s | 3 |
| 1992 | 14.7°C | 8.5°C | 2.2°C | 24.2°C | -5.0°C | 17 mm | 69% | 3.3 m/s | 2.4 |
| 1991 🌧️ | 13.6°C | 8.4°C | 3.2°C | 21.8°C | -2.3°C | 125 mm | 78% | 2.8 m/s | 2.4 |
| 1990 | 14.4°C | 7.4°C | 0.5°C | 23.6°C | -8.2°C | 12 mm | 62% | 3.2 m/s | 3.1 |
| 1989 | 11.1°C | 4.1°C | -2.8°C | 24.6°C | -15.6°C | 7 mm | 58% | 3.2 m/s | 3.2 |
| 1988 | 15.7°C | 8.8°C | 1.9°C | 23.5°C | -5.2°C | 20 mm | 56% | 2.9 m/s | 3 |
| 1987 | 14.8°C | 7.9°C | 1.1°C | 24.3°C | -7.5°C | 53 mm | 62% | 3.3 m/s | 2.7 |
| 1986 | 12.4°C | 7.1°C | 1.8°C | 22.3°C | -4.6°C | 74 mm | 81% | 2.5 m/s | 2.3 |
| 1985 | 14.2°C | 6.8°C | -0.5°C | 23.2°C | -7.0°C | 1 mm | 65% | 2.8 m/s | 3.2 |
| 1984 | 16.8°C | 11.0°C | 5.2°C | 22.6°C | -4.3°C | 77 mm | 75% | 3.2 m/s | 2.3 |
| 1983 ❄️ | 10.2°C | 3.7°C | -2.7°C | 23.5°C | -14.0°C | 3 mm | 60% | 3.5 m/s | — |
| 1982 | 13.7°C | 7.4°C | 1.1°C | 22.8°C | -5.9°C | 40 mm | 66% | 3.3 m/s | — |
| 1981 | 16.4°C | 9.3°C | 2.1°C | 25.2°C | -5.9°C | 2 mm | 61% | 3.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 15.5°C with lows near 1.8°C (mean 8.7°C), based on 45 years of NASA POWER data.
December averages 24 mm of rainfall in San Angelo, one of the drier months. The wettest on record was 125 mm in 1991.
The hottest December reached 30.7°C in 2021. The coldest dipped to -15.6°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 4.6°C. Daytime highs moved from 14.3°C to 19.3°C and overnight lows from 1°C to 5°C over the same span.
December is one of the cooler months of the year in San Angelo and one of the drier months, so plan for around 15.5°C daytime highs and 1.8°C at night.
Not quite — December is the 2nd coolest month in San Angelo, averaging 8.7°C.
For December in San Angelo, pack warm layers and a jacket for chilly mornings, with typical highs of 15.5°C and lows of 1.8°C.
Relative humidity in December averages 63% — moderately humid.
Average wind speed in December is 3.1 m/s. The windiest December on record averaged 3.7 m/s (2008).
The wettest December on record was 1991 with 125 mm. On average, December sees 24 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in San Angelo behaves each December, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for December specifically, along with year-by-year records and how the month has changed over the decades.
